>>1922601The rest of this stuff is just going to get better as you learn how to use the program and the pen tool, but here are some things.
First is the bag's pins. Making an ellipse with the circle tool and tilting it makes a smooth object that fits the shape in the image. The star was made with a hump copy/pasted five times. Try to keep track of what the image intended the object to look like and not what the pixels look like. The example rabbit has circle eyes and the green pin is a pattern.
The chain on her bag looks like a line of circles in the original. Black outlines and small size makes it look different when traced. The Closer example chain keeps the same number of 'beeds', and the other makes them the same size but uses more.
Second is areas where you can see where your nodes are (Yellow circles). Always try to use as few nodes as possible, but when you must use a node midway try to make it smooth so that if flows into the next.
Third is line thickness. Line thickness is a bit tricky which is why I would use the line tool cheat for the cord, but it can't be done for the bag's green outline or sleeve pattern. The red arrows show some areas where things get thicker/thinner where they should be constant.
I just now looked at the original image, and this is a really bad one for trying to include shades. shading fades in a lot here so there isn't always a distinction between a single shaded/non shaded area. Anyway, because you did try to include shade it draws attention to un-shaded areas. The blue circle is shaded in the original but now yours. It looked off due to how bumpy the sleeve was without the shade showing the folds. Lastly remember to keep hair going form thick to thin. The lower one looks off because it folds in the original, but it's such a minor detail that it looks a bit better when changed.
Only really looked at the bag area of the image this time, but you get the idea.